Greasy fat goes straight to your hips, but the "good" fats known as omega-3 head upstairs to cushion your brain cells, helping mood and memory. "Foods rich in omega-3 fat DHA will improve your outlook today, while cutting your risk for dementia down the road," says Somer. Natural sources include salmon, mackerel, herring and sardines. If you're not a fish fan, look for DHA-fortified foods like Horizon and Silk milks, Gold Circle Farms eggs and Mission Life Balance tortillas. And because fat is satiating, omega-3s curb hunger for hours.